DockerCLI/cli/command/image/load.go

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package image
import (
"context"
"io"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/command/completion"
"github.com/docker/docker/pkg/jsonmessage"
"github.com/moby/sys/sequential"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
type loadOptions struct {
input string
quiet bool
}
// NewLoadCommand creates a new `docker load` command
func NewLoadCommand(dockerCli command.Cli) *cobra.Command {
var opts loadOptions
cmd := &cobra.Command{
Use: "load [OPTIONS]",
Short: "Load an image from a tar archive or STDIN",
Args: cli.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
return runLoad(dockerCli, opts)
},
Annotations: map[string]string{
"aliases": "docker image load, docker load",
},
ValidArgsFunction: completion.NoComplete,
}
flags := cmd.Flags()
flags.StringVarP(&opts.input, "input", "i", "", "Read from tar archive file, instead of STDIN")
flags.BoolVarP(&opts.quiet, "quiet", "q", false, "Suppress the load output")
return cmd
}
func runLoad(dockerCli command.Cli, opts loadOptions) error {
var input io.Reader = dockerCli.In()
if opts.input != "" {
// We use sequential.Open to use sequential file access on Windows, avoiding
// depleting the standby list un-necessarily. On Linux, this equates to a regular os.Open.
file, err := sequential.Open(opts.input)
if err != nil {
return err
}
defer file.Close()
input = file
}
// To avoid getting stuck, verify that a tar file is given either in
// the input flag or through stdin and if not display an error message and exit.
if opts.input == "" && dockerCli.In().IsTerminal() {
return errors.Errorf("requested load from stdin, but stdin is empty")
}
if !dockerCli.Out().IsTerminal() {
opts.quiet = true
}
response, err := dockerCli.Client().ImageLoad(context.Background(), input, opts.quiet)
if err != nil {
return err
}
defer response.Body.Close()
if response.Body != nil && response.JSON {
return jsonmessage.DisplayJSONMessagesToStream(response.Body, dockerCli.Out(), nil)
}
_, err = io.Copy(dockerCli.Out(), response.Body)
return err
}